Q1. Laser light at 635nm falls on a double-slit apparatus with slit separation 6.9*10^-6m. Find out the separation between the third and fourth bright fringes, as seen on the screen 2.4m from the slits.
Q2. Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass and radius of orbit. The satellites fire rockets that provide force needed to keep a circular orbit around the space station. The gravitational force is negligible.